tweak: utm info for lab banner

Author: shhdgit

locale/en/translation.json

@@ -165,7 +165,7 @@
     "success": "Thank you! You will be notified when a new TiDB LTS release comes out."
   },
   "banner": {
-    "link": "https://labs.tidb.io/",
+    "link": "https://labs.tidb.io/?utm_source=docs&utm_medium=direct&utm_campaign=labs_lp_05",
     "title": "Explore the new TiDB Labs, learn distributed SQL database and build RAG apps directly from your browser.",
     "date": "",
     "intro": ""

locale/ja/translation.json

@@ -149,7 +149,7 @@
     "goToFeedback": "このページは役に立ちましたか？"
   },
   "banner": {
-    "link": "https://labs.tidb.io/ja",
+    "link": "https://labs.tidb.io/ja?utm_source=docs&utm_medium=direct&utm_campaign=labs_lp_05",
     "title": "新しい TiDB Labs を探索し、ブラウザから直接分散型 SQL データベースを学び、RAG アプリを構築しましょう。",
     "date": "",
     "intro": ""

locale/zh/translation.json

@@ -162,7 +162,7 @@
     "success": "感谢订阅！当新的 LTS 版本发布时，我们会通过邮件通知您。"
   },
   "banner": {
-    "link": "https://labs.pingcap.com/",
+    "link": "https://labs.pingcap.com/?utm_source=docs&utm_medium=direct&utm_campaign=labs_zh_lp_04",
     "title": "探索全新的 TiDB Labs，直接在浏览器中学习分布式 SQL 数据库并构建 RAG 应用。",
     "date": "",
     "intro": ""